Common Units of Measure and Conversion Factors Area

Common Units of Measure and Conversion Factors

• Area (Length x Width) • • SQI-square inches (in²) SQF-square feet (144 in²) MSI-thousand square inches (1000 in²) MSF-thousand square feet (144, 000 in²) SYD-square yards (1, 296 in²) SQM-square meter (1, 550 in²) SQKM-square kilometer (1, 550, 000 in²)

• Weight • • • LBS –pounds MLBS-thousand pounds Ton-two thousand pounds KG-kilogram (2. 2 lbs) MT-Metric tonne (1000 kg)

• Basis Weight (Weight/Unit Area) • Common units: • LBS/RM- Pounds per Ream • 36” x 24” x 500 ream basis • 3, 000 SQ FT • 432, 000 SQ IN • GSM- Grams per Square Meter • 1 LB/RM= 1. 63 GSM (i. e. 3. 1 LB/RM= 5 GSM) • 1 GSM= 0. 61 LB/RM (i. e. 5 GSM= 3. 1 LB/RM) • Yield is the Inverse of basis weight (Sqi/Lb or M²/Kg)

Basic Measures | Converting Weight to Area • To convert weight to area requires three pieces of information: 1. Weight (lb) 2. Basis Weight (lb/rm) 3. Width (inches) • Basis Equation: • Linear Feet=(Weight)/(Basis Weight*Width*12) • Linear Yards=(Weight)/(Basis Weight*Width*36) • Linear Meters=(Weight)/(Basis Weight*Width*39. 37)

Basic Measures | Converting Area to Weight • To convert area to weight requires three pieces of information: 1. Area (Sqi) 2. Basis Weight (lb/rm) 3. Width (inches) • Basis Equation: • Pounds=(Area*Basis Weight)/432, 000 • Kilograms=(Area*Basis Weight)/950, 400

Basic Measures | Thickness (Caliper) • Thickness also referred to as caliper • Imperial (English) units • Mil –. 001” (one thousandth of an inch) • Referred to as Gauge for film (100 GA=. 001”) • Referred to as Point for board (8 PT=. 008”) • Metric units • Micron – 25. 4 Micron= 1 mil=. 001”=. 0254 mm • . 000235” foil = 6 um =. 006 mm